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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cb1d40963bec5ba72b8203ec6a48f344b78c16eba4d0841be8b2f097ea98ca3' 
  AND token = '/0D/FKI3Hxn50bIPoDXA08ApWofGZyErTr6nYcWV9Jg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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