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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbd6c95bef916d093284a032f2761b37da55229a302001fd87ad4854dfd0cf15' 
  AND token = '8PLAt0AtplZ1xyNvD1h31D/tBA51txTf9Ej4nOCwpRI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00158

JSON explain

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