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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1731a9b55cd2ad840197f5dfa037c7fc2d1b0a949ffa04ac04b68909e47c71c4' 
  AND token = 'UEabdIOkKHdwG4TtFgAQjwmtyb7qZKOwOaFPG5iuMCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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