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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2af7507e012fe959deed869c50ebbab54239b4941d12afb117ff126baf672248' 
  AND token = 'OTTLo4M8os2dzpx54fznyX/pueceJ709NRNLkpfXANE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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