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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0445c42c9dade640523d5d3ebd0d08dd6445359f9d6c081cbdc5071d079a342' 
  AND token = '0QBZlq4OKtv2AVLYZE9OJz2YqGLfQMSHWRK8BmN8iV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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