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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3a8bee4c2868cee5313b8c5c249856e77388eb39494013ed244ded9fde7e364' 
  AND token = '/Pf4vsKJvMicu1cQ9+9WrpESqgSQWotPCPDbWIaXDpk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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