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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adf69371d2c8c93d5b53fd1b6152041bbc613b572eb90860471ab5330b9222de' 
  AND token = 'M7H8g0y53/8CdUEQHzyROKCw1LjW7kd8DAdM+N+duKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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