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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84bcb19aa752b50217eb4759bab91c3a44f95f0cebb52ca13cbbce91a08e0b69' 
  AND token = 'MUPjygRqPQX4nUAlIs5TFNqufZqQG0NqIGEmcwwPUUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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