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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5eef04fbb5cf1120eb007e986144aa0892d93f1a1f319c4ded164c89fff5f3d0' 
  AND token = 'qTOHtlvyRAz25x7xMBSxyRvG1YtAhQdjRT+cxb4UB1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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