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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3ff35545703fa4ffdfffc1d91ef1f4e8a82e2c31f459900c8053ea3ad5285e3' 
  AND token = '8AkLAKHa5u6yE9R5aWGy+q0SNV63lbaxg32TmA+ZzYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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