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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09c8c5f1f6a68a166ed40a98fa4a15fe0855af2b30c806565de9c527431dd5f5' 
  AND token = 'CkyCoFGQh8YMmtwU8paC5g8+MENNVsNaYL4fRvFbDhE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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