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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a17c637a2c3f44e55c1be17eb4c8c5e6d790ffce8e831022036af280fef77b96' 
  AND token = 'Lgu6OdgI/W7aka2FvEZ06UYbb673oJYEnzjMx5+K9Ys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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