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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c682d9259e4144eea6db546b9dd86f7354e43f058ef0cde9547b9715c75ccefc' 
  AND token = 'YBIHCalfgE6t+qzbK7PUH8pzDG6waOkmVqY9tPaPifE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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