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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9e0dab129b15fe552d1ab2b26ffdf75664f77eb20eaa12b36a15618c0367e54' 
  AND token = 'NPg92ADcho4+kWi4SlpW9SZvPWTqvycs4WJyFTONuCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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