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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18896092530a6b00089d654a5e7de499d1f91702f23220f7c860661b5064e0bd' 
  AND token = 'eGdJiuQ3e8xmKAHeQezqcfOVtmPIUGgjOY3PO3+9p20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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