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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cba738d15c3c88b7c78fdd007072bab5c9ba5a37b074233e2a0a3d02fd464c5c' 
  AND token = 'j9xLunDmQpfaG0Y3K2ubUSnFsCfWcGZXXL8b9lUyR8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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