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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1dbd43272899e68470efa4616b8d7b0034acfb9128f5d7e3278925677f218822' 
  AND token = 'Xt1x1djUU22C1Hcw+vUe27fG1wJgoNY3fyyTkHGo+74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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