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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b2b3418cbded81a3c85a8611822551cfbf5a3cf1769e2342a371e596360e2f9' 
  AND token = 'gWCfqEvOUQEE11aNjSeqJO1+s2bhgDhqSL24vhYBAGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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