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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ec828f478067a84c992444e4b28ecb7dd642a52648f47408e355bf931460dc0' 
  AND token = 'mufDCaCUu+DYhggN8fO6mxIxq3ILj4Dp0hmYYfrYZ8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00066

JSON explain

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