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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c95c6a652e89452e32235710514417270ea522da91558906b96516ae0633d5f3' 
  AND token = 'Z5tLJ6X4eLa3wIG0N0KdDOYteWJg3cHOzj6gTLAWYUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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