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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '097250ab3f6dd59e660608eafca09fed2fa8f00c930539a09ed9442cc6966427' 
  AND token = 'tlP5DKuK9ltCi4xOUYzMWI+0W0YsOOOPjGQAt76THwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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