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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '925b99b276e17bfffe83375df4166dd4038ebc10c486b2b22220a99a799631b9' 
  AND token = 'l8zVR4rEkXyp8eQpW4i1qGIke8ANRUaN72FC+rIshUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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