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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '266e1b02c0de75f1bc3214bb4760121066f5398fb82629cb79a59cf7ff6d20c1' 
  AND token = 'ShWQZ8mSq93LgIovGObo+X0Spjo0qjBWRNminZ564Qg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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