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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08c9e916f88a869de7071c16a660bfc3ffcd108df83cdeb2fe1e5628dafcc9d3' 
  AND token = 's+8zocxYt0lyHzs8H+qYBZpX9a1MoBAJGFT71mfso50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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