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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e528eec2df08af3423fc96a3a411c35c23124736d40a062bef57c6b2dc3a11e' 
  AND token = 'CCUC+cMUvNtprX3mPJsWyrt55O8XBq8nkbKJJN+8ozI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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