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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a092b11bce28f8d5efeafa7acc313cbf3ccd26b7cc4801f93d1a7aa97240cc21' 
  AND token = '6dH6pF/rNY2AD5M/m7fr0DfrtXPZPQ3LyX/7ITrmCFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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