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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2b15bd907a4b3692f64e9b80d513a3295238e97665db7de6700e601d0a19a27' 
  AND token = 'DRrn9tQjypn+NY5cStBh+bibpBbgds/8khk+aNy8biE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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