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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '892de60939a95aa397b829c704449b542ccc736f3d9340d7eff4ceb9e02c625f' 
  AND token = 'j0g7QBU+g8KzYjpuqnqTMY2Cbr3i+I/dYUEOkNHrEe0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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