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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07237539fd97b76b63f66bd515c1c6d5d29468dcb950925eddd4f3268b54db9c' 
  AND token = 'jcVmn5b5j69HBqoq5T2iMnpOkg8TU6XXIv2GQZ9l9EI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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