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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5205a1c60b70ff13863d157d3c05666c30d3f97c5141f85f3885583c8aa40a2' 
  AND token = 'F/iEUgHDsAYR7zHrG4vVWs/Ku19FD17C/Wja3uzum24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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