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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40a8a2e0c36b91fd9b636df931716f6c475176f9bb4782b5a0de1b088bcd43f7' 
  AND token = 'wm9dvj3LDWoRdt6rV+1bhAvjvPh1Qk1+FnPp5Pu9M8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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