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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6637bbab6688d9e959a3da3ee855cbe7c90abaf9b43e894088feeb984666a091' 
  AND token = '1AQlsqWKEYdC2oMEE1zzyLmZIakhAg2Tz8PPbUxj2N4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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