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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52b34a3a089e7f726002173086fc97fdce60219d4de88655a85811fbb85dde2a' 
  AND token = 'bxaC9sZcQXbx31i4gdiQpa/rb5KhhprRn3Bixrodv30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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