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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4d772d34bf6b1d24388647154bbdd3b6ca0f908c672cd4cc7ce82a3713fc429' 
  AND token = 'AV3JIVEUzsaEcKf6kHOyMEnCB267rZfhFlu7ZFDto08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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