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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '567af345846e32a0bfd57c91f2cf037a24e3e29f5ad54e6e8cdf7aa0fca155c5' 
  AND token = 'D6iJWukAPo+GA/QykVfeTqrSFbWDne6lHxIEnR2/6VM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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