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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b40714a5e834318541cf97a099c2ccddc260a30a3930a8ef6e1caa5c93a945b' 
  AND token = 'YNeWmnwg7lNv7ek+bNLSvT64leaDd8nheMvW54t6B6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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