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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd98bf04cf93dae66da74001f6b180d7efd92b218018bbf7126700d0d4b45f47' 
  AND token = 'R440KuYdUO2kUvt/BHAhyk9bPOFH2ndEJxj6atAqFpI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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