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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b5e3d8d9a92a01273a2a8713ed391f4d94e93637986e0e5f088156c9bd661d7' 
  AND token = 'vg5OJoPNLlnSQf+168yBeCIIChzhpjFVyr+Vp38PS68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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