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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e148969c77332e8de2f0715850a2e135793868704b27d0a34bec2b3490dd9f1d' 
  AND token = 'SvpY52UeiTmmgGg12tQ9DQKQwgRBjIcw5D3If26fGNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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