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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16e4ffd21d0b725263f2c0b209aae8a6425d7a802408bc37093865b04c44aaab' 
  AND token = 'cNEFEwYEhd3ZNl7kc0BdUzZJADD84nv1lX9F7igLlbs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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