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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f3223437007a7cf7be715fffd02ca33ee692c9912a69b790b12529ef61e8b33' 
  AND token = '+jqkl6MGFQlGFO4nJ32qPWkuFJkj3EwnEw0mBLFWhPo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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