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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7af5fe4305b52e3b7a8686e09272da4aa1f52d3be6bbf8df52c32d8e6f0d9bd6' 
  AND token = 'ityP0Wh5ahD4iCqPGwLRa3+oplPOQAv0yKUv62btUmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}