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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60a5703b32eef7cdc87ced55bee2483b3e4719c2b906ca546d7a14c24561a38a' 
  AND token = 'gb3baW9deLgt+N1sT5MQKBiawtTdtZ1KSidABtxm2k8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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