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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6516de2eeb95a8752b66cfc95f0bbecd5bf16e69508880f7351a7bef6d025ed4' 
  AND token = 'VAoCb0zT5Lx/lQKY3x1G7ALOwrXBftjx+MngpT0fgTk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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