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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e85afb92ab2b5b030603a4557132a7500b0f509f4cb847d982ddec2cbcb1c73' 
  AND token = '8A1jKtIoE+jomfWmA7mceWedmHrPla5u0diiXeaMDCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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