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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b4b5b5f3aa24c0d3786a83dd5a5b56136ff2e573fd510fbd43fdd18f5911a59' 
  AND token = '8B5LbcVH/2rCWtg2JYfFU4sJPePGT8FWJrd7zEu3IsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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