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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b167d685445e5f55253ea8ea23c7ca8afc40c0814963d80f681e6767312a1b27' 
  AND token = 'zGJdOc8AS0Vw8iRWaqs9ewMJNpyZgypkFrk2ILnaADM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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