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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c5f04c8500efc2e7ab2bcebedba34d765aaf0a01ed35adae8824ea2ba44513e' 
  AND token = '0LDPQbswB4t5luWBi5kxHVs28RVbVpcuE+wXbABVFIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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