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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01508302fdf47a1d3e47e31da3af2fb5d1624b34bc72ea9d17e7b87f27c22a36' 
  AND token = 'm4sJLSZ8zGx22dTZO9uW5AgCjovPZ3qdetp8+T2yImE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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