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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb2bfc3ff6f2608c6475c1eba4b7979e9406b8ef94e4356a090719fcccddf8ae' 
  AND token = '90YZMM6JGbY5IT8JX5htw9h7yDlzEdemzL4fKLOI1qw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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