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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9787fd4851bf6c165f843a36baeeefec41273360cc99bb4e3962dce8bbccd65b' 
  AND token = '0nkn/BC2Nl3pjKjLLgnFj6b8ybu1vtM/1KcVjiVbzeo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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