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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5eb76e6c1b2812d986c5ea6858caa00e7d355c282f7aee3def2e510a6e2d4d6' 
  AND token = 'DqcAwDPw6LX0Cp+1EgVTeYAj2E9iEpcIHImgEGX6eOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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