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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba0a050e2a988d395d4d752ab6780ce4418e1f0745a2999022fa0819dcc4cc37' 
  AND token = 'ErZ/B5hscxOYnm81Zq3WSlbn8SdfIK7rRs7UYmyYnc0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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