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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cae869a91cb9c0d1883ceba3ea30cb6a5dc361e16c89f0e5f718dc736b0973b' 
  AND token = '6g/clAI+TeGFla3sMI5wUpDEECH98OnT+g2Ryc01vLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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