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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbc0c4c9f270d8d4fd1328b2a7b2af7d17563c250ad4d6b0433a0bc9ed2f24ad' 
  AND token = 'JA8ai4z0G34BN2AhOsRId+z0lM7umfkjWgaLKCrlg4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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