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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ab1352ca8619c4a1a126c0fc9c299fbc4771dc698a745316d23e0a8c79b96f7' 
  AND token = 't1oDG1JtbKGhtcL4Qp6pxzTCJOGSbaTA0IB1fnpKJHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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