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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a30ae1e5faaef69b3c35d9c6b083f7cc12b83b82502d9a02362f23143eb3610a' 
  AND token = '+Xe7CKdEmi3HzR5vXBzqtyDDHMmhYkh4EnYdSEaPMzE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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