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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29010138ead2a804cffac7ce584b352d843d427413dd48d1c71a0e1a75a9be7b' 
  AND token = 'h16JrWJig4MmdwtQuW85HwdMSXEkuaGpbewivirFofg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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