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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a607a48ff0dc69d1b08a4c479ecb6be2fd74eb5fe7790aa3fb8c582e45f42bb5' 
  AND token = 'a7JS0Dk/30H247I+1MwrRQO88XmMupr2AJv1+4Xs3l8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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