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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ffdec839248b8514db7b8313d9cdfede2a041c82c45b37dea4d287ef680242e' 
  AND token = 'e8Qy/N7OfbHiDxZxsbqiEnBPV3Ycsq+fD2wVblmxil4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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