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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f196e999ad74753c058bba3a43462ff579f6f03f9cbd515e152a68049e62143b' 
  AND token = 'lwWbernb/Fy99PmsA68RLflMSF+qlGO8Hp/4IowXWrw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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