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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e0dbefd428b6c5f2f00befb2bb09d3739f0538ea7b5eac9861caa04675847dd' 
  AND token = '5hQwdAMY2rL4dTqzlry09bytbcz8rldIxQNaLYzq9jc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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