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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b612fbe3cf5a6c38a34967936a4bf826117c0dc519ad78b480e6fec62fc393fc' 
  AND token = 'EiHpinuG9RbvJQDZlYsCcP6MmueZaIXj9PZX1Zuizfw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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