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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1b2ecc731d407c5ebe511e3c16312dee0d85712b58dd2ecefc620c4283892dc' 
  AND token = 'hceiwpP4WuTN8/SVjlHHvyIB3t09KwrEGpSZ+FqQCZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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