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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30560760e0cf5ea033e2b242d32dd2f83ab0a8f4d3bd718ca61d701d84e5b5fe' 
  AND token = 'zZoeXF81DrO0rHLc1Nf4kXFHbfxBkQ3HErDdzmgXKp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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